package code.warehouse.common.xss;


import org.apache.commons.lang3.StringUtils;

import code.warehouse.common.exception.CommonException;

/**
 * sql过滤.
 * package code.warehouse.common.xss
 *
 * @author zli [liz@yyft.com]
 * @version v1.0
 * @create 2017-05-12 11:10
 **/
public class SQLFilter {

    /**
     * SQL注入过滤
     *
     * @param str
     *         待验证的字符串
     */
    public static String sqlInject(String str) {
        if (StringUtils.isBlank(str)) {
            return null;
        }
        //去掉'|"|;|\字符
        str = StringUtils.replace(str, "'", "");
        str = StringUtils.replace(str, "\"", "");
        str = StringUtils.replace(str, ";", "");
        str = StringUtils.replace(str, "\\", "");

        //转换成小写
        str = str.toLowerCase();

        //非法字符
        String[] keywords = { "master", "truncate", "insert", "select", "delete", "update", "declare", "alert", "create", "drop" };

        //判断是否包含非法字符
        for (String keyword : keywords) {
            if (str.indexOf(keyword) != -1) {
                throw new CommonException("包含非法字符");
            }
        }

        return str;
    }
}
